#!/bin/bash

# -------------------------------------------------------------------------- #
# Copyright 2002-2016, OpenNebula Project, OpenNebula Systems                #
#                                                                            #
# Licensed under the Apache License, Version 2.0 (the "License"); you may    #
# not use this file except in compliance with the License. You may obtain    #
# a copy of the License at                                                   #
#                                                                            #
# http://www.apache.org/licenses/LICENSE-2.0                                 #
#                                                                            #
# Unless required by applicable law or agreed to in writing, software        #
# distributed under the License is distributed on an "AS IS" BASIS,          #
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.   #
# See the License for the specific language governing permissions and        #
# limitations under the License.                                             #
#--------------------------------------------------------------------------- #

###############################################################################
# This script is used to remove a VM image (SRC) from the image repository
###############################################################################

# ------------ Set up the environment to source common tools ------------

if [ -z "${ONE_LOCATION}" ]; then
    LIB_LOCATION=/usr/lib/one
else
    LIB_LOCATION=$ONE_LOCATION/lib
fi

. $LIB_LOCATION/sh/scripts_common.sh

DRIVER_PATH=$(dirname $0)
source ${DRIVER_PATH}/../libfs.sh

# -------- Get rm and datastore arguments from OpenNebula core ------------

DRV_ACTION=$1
ID=$2

XPATH="${DRIVER_PATH}/../xpath.rb -b $DRV_ACTION"

unset i XPATH_ELEMENTS

while IFS= read -r -d '' element; do
    XPATH_ELEMENTS[i++]="$element"
done < <($XPATH     /DS_DRIVER_ACTION_DATA/IMAGE/SOURCE \
                    /DS_DRIVER_ACTION_DATA/DATASTORE/TEMPLATE/BRIDGE_LIST \
                    /DS_DRIVER_ACTION_DATA/DATASTORE/BASE_PATH)

unset i

SRC="${XPATH_ELEMENTS[i++]}"
BRIDGE_LIST="${XPATH_ELEMENTS[i++]}"
BASE_PATH="${XPATH_ELEMENTS[i++]}"

# ------------ Remove the image from the repository ------------

if [ -n "$BRIDGE_LIST" ]; then
    DST_HOST=`get_destination_host $ID`

    ssh_exec_and_log "$DST_HOST" "[ -f $SRC ] && rm -rf $SRC $SRC.snap" \
        "Error deleting $SRC in $DST_HOST"
else
    BASENAME_SRC=`basename "${SRC##$REMOTE_RM_CMD}"`
    if [ -f "$SRC" -a `dirname "$SRC"` = "$BASE_PATH" -a -n "$BASENAME_SRC" ]
    then
        log "Removing $SRC from the image repository"

        exec_and_log "rm -rf $SRC $SRC.snap" \
            "Error deleting $SRC"
    else
        log_error "Bad formed or unavailable Image source: ${SRC}"
        exit 1
    fi
fi
